Battery monomer, battery and electric device

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery monomer, a battery and a power utilization device, the battery monomer comprises a shell, an electrode assembly, a first electrode terminal and a second electrode terminal, and the electrode assembly is arranged in the shell; the first electrode terminal is electrically connected with the electrode assembly; the second electrode terminal is electrically connected with the electrode assembly, and the first electrode terminal and the second electrode terminal are different in polarity and used for outputting or inputting electric energy; wherein the shell is of a prism structure, the shell is provided with a first side wall and a second side wall which are oppositely arranged in the axial direction, the first side wall and the second side wall are square, at least one of the first electrode terminal and the second electrode terminal is arranged on the first side wall or the second side wall, the shell is of a quadrangular prism structure, and the shape of the single battery is square. And the battery monomers can be flexibly grouped, so that the placement requirements of most box bodies can be met, the space in the box bodies can be better utilized, and the volume energy density of the battery is improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a battery cell, a battery and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] A battery usually includes a box and a plurality of battery cells. The plurality of battery cells are placed in the box. However, due to the limitation of the external dimensions of the battery cells, it is difficult for the battery cells to meet the loading requirements of batteries of a certain size.

[0004] The above statements are only used to provide background information related to the present application and do not necessarily constitute prior art. Utility Model Content

[0005] The purpose of the embodiments of the present application is to provide a battery cell, a battery and an electrical device, including but not limited to solving the problem in the related art that the battery cell is limited by its external dimensions, making it difficult for the battery cell to meet the loading requirements of batteries of a certain size.

[0006] The technical solution adopted in the embodiment of the present application is:

[0007] In a first aspect, a battery cell is provided, which includes a shell, an electrode assembly, a first electrode terminal and a second electrode terminal, wherein the electrode assembly is arranged in the shell; the first electrode terminal is electrically connected to the electrode assembly; the second electrode terminal is electrically connected to the electrode assembly, and the polarities of the first electrode terminal and the second electrode terminal are different for outputting or inputting electric energy; wherein the shell is a prismatic structure, the shell has a first side wall and a second side wall which are arranged opposite to each other along the axial direction, the first side wall and the second side wall are square, and at least one of the first electrode terminal and the second electrode terminal is arranged on the first side wall or the second side wall.

[0008] When the battery cell of the embodiment of the present application is in use, the external electronic device is electrically connected to the first electrode terminal and the second electrode terminal to form a circuit loop, and the electrode assembly in the shell undergoes an electrochemical reaction, thereby realizing the input and output of electrical energy of the battery cell; the shell has a prismatic structure, and the first side wall and the second side wall of the shell arranged along the axial direction are square, that is, the shell has a quadrangular prism structure, the battery cell is square in shape, the battery cell can be flexibly grouped, can meet the placement requirements of most boxes, and can also better utilize the space in the box to improve the volume energy density of the battery; in addition, in the process of grouping the battery cells, there is no need to distinguish the length and width directions of the battery cells, which is conducive to improving the assembly efficiency of the battery cells.

[0009] In some embodiments, the first electrode terminal and the second electrode terminal are disposed on the first side wall, and an angle between an arrangement direction of the first electrode terminal and the second electrode terminal and a length direction of the first side wall is α, wherein 0°≤α≤45°.

[0010] By adopting the technical solution of this embodiment, since 0°≤α≤45° and the first side wall is a square, the length direction of the first side wall can also be called the width direction of the first side wall, so the first electrode terminal and the second electrode terminal can be flexibly arranged on the first side wall to meet the needs of different battery cells; in addition, the first electrode terminal and the second electrode terminal are simultaneously arranged on the first side wall, which can facilitate the electrical connection between the battery cell and the busbar component.

[0011] In some embodiments, the first electrode terminal and the second electrode terminal are respectively located at two opposite corners of the first side wall.

[0012] By adopting the technical solution of this embodiment, the distance between the first electrode terminal and the second electrode terminal is far, so a large pressure relief mechanism or multiple pressure relief mechanisms, such as a double pressure relief mechanism, can be set between the first electrode terminal and the second electrode terminal to improve the pressure relief effect and improve the reliability of battery use; at the same time, the distance between the pressure relief mechanism and the first electrode terminal or the second electrode terminal can also be set larger, which can also reduce the impact of the emissions released by the pressure relief mechanism on the electrode terminals and the busbar, thereby improving the reliability of battery use. In addition, in the process of grouping multiple battery cells, the adjacent corners of adjacent battery cells can also be centrally set with the first electrode terminal or the second electrode terminal to facilitate the electrical connection between the battery cell and the busbar.

[0013] In some embodiments, the first electrode terminal and the second electrode terminal are disposed on a first side wall, and the first side wall is provided with at least one pressure relief mechanism for releasing emissions; and / or, the second side wall is provided with at least one pressure relief mechanism for releasing emissions.

[0014] By adopting the technical solution of this embodiment, the position of the pressure relief mechanism can be flexibly arranged to meet different usage requirements.

[0015] In some embodiments, the pressure relief mechanism comprises a circular pressure relief mechanism.

[0016] By adopting the technical solution of this embodiment, after multiple battery cells are grouped, the circular pressure relief mechanism will not change due to the different placement of the battery cells; the circular pressure relief mechanism has good consistency in position, which is conducive to reducing the difficulty of designing the subsequent pressure relief channel connected to the pressure relief mechanism.

[0017] In some embodiments, the electrode assembly is a flat structure.

[0018] By adopting the technical solution of this embodiment, the electrode assembly has a flat structure, but the shell of the battery cell is a quadrangular prism. The battery cell is square in shape, which can meet the placement requirements of most boxes and can also better utilize the space in the box to improve the volume energy density of the battery. In addition, in the process of assembling the battery cells into batteries, there is no need to distinguish the length and width directions of the battery cells, which is conducive to improving the assembly efficiency of the battery cells.

[0019] In some embodiments, the shell also has a third side wall and a fourth side wall parallel to and adjacent to the axial direction, the surface with the largest area of ​​the electrode assembly is the large surface, the third side wall is arranged opposite to the large surface, and the thickness of the third side wall is greater than the thickness of the fourth side wall.

[0020] By adopting the technical solution of this embodiment, during the charge and discharge process of the battery cell, the large surface of the electrode assembly expands most obviously, and the large surface of the electrode assembly is opposite to the third side wall, so that the third side wall can limit the expansion of the electrode assembly, and the thickness of the third side wall is greater than that of the fourth side wall. The thickness of the third side wall is thicker, and the effect of limiting the expansion of the electrode assembly is better, which is beneficial to improving the reliability of the battery cell.

[0021] In some embodiments, the housing includes a shell and an end cover, the end cover covers the opening of the shell, the end cover forms a first side wall, and the side wall of the shell opposite to the end cover forms a second side wall; or, the end cover forms the second side wall, and the side wall of the shell opposite to the end cover forms the first side wall.

[0022] By adopting the technical solution of this embodiment, the outer shell adopts the structure of a shell and an end cover, so that the electrode assembly can be loaded into the shell from the opening of the shell, and then the end cover is covered at the opening of the shell, and the operation of inserting the electrode assembly into the shell is simple and easy to assemble.

[0023] In a second aspect, a battery is provided, comprising a battery unit, wherein the battery unit comprises at least one battery cell as described in the above embodiment.

[0024] The battery of the embodiment of the present application adopts the above-mentioned battery cells, and the battery cells are more flexibly grouped, which can meet the use requirements of batteries of different sizes, and is also beneficial to improving the volume energy density of the battery, and is also beneficial to improving the assembly efficiency of the battery.

[0025] In some embodiments, the battery unit includes at least one layer of battery cells, each layer of battery cells includes a plurality of battery cells arranged in a matrix along a first direction and a second direction, and the first direction is perpendicular to the second direction.

[0026] By adopting the technical solution of this embodiment, multiple battery cells are arranged in a matrix along the first direction and the second direction, and the battery cells are in the form of quadrangular prisms. There is no need to distinguish the grouping directions of the battery cells during assembly, so a relatively regular battery unit can be formed, and the assembly efficiency is higher.

[0027] In some embodiments, the first electrode terminal and the second electrode terminal are arranged on the first side wall, the first side wall is perpendicular to the third direction, and in the same layer of battery cells, all first side walls are located on the same side of the corresponding layer of battery cells, and the first direction and the second direction are perpendicular to the third direction.

[0028] By adopting the technical solution of this embodiment, the first electrode terminals and the second electrode terminals of all the battery cells are located on the same side of the corresponding layer of battery cells, so that the first electrode terminals and the second electrode terminals can be exposed outside the corresponding layer of battery cells, thereby facilitating the connection of the first electrode terminals and the second electrode terminals with the busbar component and facilitating the electrical connection between the battery cells.

[0029] In some embodiments, the first electrode terminal and the second electrode terminal are disposed on a first side wall, and the first side wall is perpendicular to the first direction.

[0030] By adopting the technical solution of this embodiment, the first electrode terminal and the second electrode terminal are arranged on one side of the battery cell along the second direction, which is conducive to arranging multiple layers of battery cells.

[0031] In some embodiments, in the same layer of battery cells, every two adjacent columns of battery cells arranged along the second direction form a battery group; in the same battery group, the first side walls of two battery cells arranged along the first direction are arranged back to back or facing each other.

[0032] By adopting the technical solution of this embodiment, in the same layer of battery cells, the first side walls of two columns of battery cells can be arranged facing each other, so that the first electrode terminals and the second electrode terminals of the two columns of battery cells can be arranged facing each other, so that the busbar component can connect the two columns of battery cells at the same time. In addition, the gap between the two columns of battery cells can also be reduced, thereby improving the structural compactness of the battery.

[0033] In some embodiments, the first electrode terminals and the second electrode terminals of two adjacent battery cells are arranged in a perpendicular or parallel direction.

[0034] By adopting the technical solution of this embodiment, the positions of the electrode terminals can be flexibly distributed to meet different usage requirements.

[0035] In some embodiments, adjacent corners of four adjacent battery cells are each provided with a first electrode terminal or a second electrode terminal.

[0036] By adopting the technical solution of this embodiment, the adjacent corners of four adjacent battery cells are each provided with a first electrode terminal or a second electrode terminal, so that the electrode terminals with the same polarity are concentratedly distributed, which can facilitate the connection of the first electrode terminal or the second electrode terminal with the busbar component.

[0037] In some embodiments, an exhaust member having an exhaust channel is provided between two adjacent columns of battery cells, and a pressure relief mechanism for releasing exhaust is provided on the side walls of the battery cells adjacent to the exhaust member. The pressure relief mechanism is connected to the exhaust channel to guide the exhaust of the exhaust.

[0038] By adopting the technical solution of this embodiment, the exhaust released by the pressure relief mechanism can flow out of the battery unit through the exhaust channel of the exhaust member, reducing the risk of contact between the exhaust and the battery cell, which is beneficial to improving the reliability of the battery.

[0039] In some embodiments, at least one battery cell in the battery unit is a first battery cell, at least one battery cell in the battery unit is a second battery cell, and the electrode assembly in the first battery cell is vertically arranged with the electrode assembly in the second battery cell.

[0040] By adopting the technical solution of this embodiment, the electrode assembly of the first battery cell is perpendicular to the electrode assembly of the second battery cell, so that the expansion force of the electrode assembly of the first battery cell is vertically staggered with the expansion force and heat conduction direction of the electrode assembly of the second battery cell, thereby reducing the accumulation of expansion force of the battery cell and reducing heat transfer between battery cells, which is beneficial to reducing the thickness of the end plate and the insulation pad and reducing the manufacturing cost of the battery; in addition, the outer shell of the battery cell is a quadrangular prism structure, and the battery cell does not need to distinguish between the length and width directions, which facilitates the vertical distribution of the electrode assemblies in the first battery cell and the second battery cell, and also facilitates the battery cell to form a regularly shaped battery unit to meet the use requirements of different batteries.

[0041] In some embodiments, the electrode assembly is a flat structure, the surface with the largest area of ​​the electrode assembly is the large surface, and the large surface of the first battery cell is perpendicular to the large surface of the second battery cell.

[0042] By adopting the technical solution of this embodiment, the expansion is most obvious at the large surface, and the large surface of the first battery cell is perpendicular to the large surface of the second battery cell, which can effectively reduce the accumulation of expansion force of the battery cells. In addition, the large surface has a large area, a large heat transfer area, and the heat transfer is fastest, which can also effectively reduce the heat transfer between battery cells.

[0043] In some embodiments, the first battery cell includes at least two stacked electrode assemblies, the second battery cell includes at least two stacked electrode assemblies, and the stacking direction of the electrode assemblies of the first battery cell is perpendicular to the stacking direction of the electrode assemblies of the second battery cell.

[0044] By adopting the technical solution of this embodiment, the expansion of the electrode assembly along the stacking direction is most obvious, and the stacking direction of the electrode assembly of the first battery cell is perpendicular to the stacking direction of the electrode assembly of the second battery cell, which can effectively reduce the accumulation of expansion force of the battery cells. In addition, the heat transfer of the electrode assembly is mainly along the stacking direction, which can also effectively reduce the heat transfer between battery cells.

[0045] In some embodiments, the plurality of battery cells along the first direction include a first battery cell and a second battery cell; and / or the plurality of battery cells along the second direction include a first battery cell and a second battery cell.

[0046] By adopting the technical solution of this embodiment, the expansion force accumulation and heat transfer of the battery cell in the first direction and / or the second direction can be reduced.

[0047] In some embodiments, the plurality of battery cells along the first direction include a first battery cell and a second battery cell, the plurality of battery cells along the second direction include a first battery cell and a second battery cell, the first battery cells and the second battery cells along the first direction are alternately arranged, and the first battery cells and the first battery cells along the second direction are alternately arranged.

[0048] By adopting the technical solution of this embodiment, the first battery cells and the second battery cells are alternately arranged in the first direction and the second direction, which can better reduce the expansion force accumulation and heat transfer of the battery cells in the first direction and the second direction.

[0049] In some embodiments, the battery unit includes multiple layers of battery cells stacked along a third direction, the multiple battery cells arranged along the third direction include a first battery cell and a second battery cell, and the first direction and the second direction are perpendicular to the third direction.

[0050] In some embodiments, the first battery cells and the second battery cells along the third direction are alternately arranged.

[0051] By adopting the technical solution of this embodiment, the first battery cells and the second battery cells are alternately arranged in the third direction, which can better reduce the expansion force accumulation and heat transfer of the battery cells in the third direction. In addition, the first battery cells and the second battery cells are alternately distributed along the third direction, so that there is no need to reserve expansion space between two adjacent layers of battery cells, which is conducive to realizing a stacking method of more than three layers of battery cells.

[0052] In a third aspect, an electrical device is provided, comprising the battery as described in the above embodiment.

[0053] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0055] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0056] Figure 2 Schematic diagram of the exploded structure of a battery provided for some embodiments of the present application.

[0057] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application.

[0058] Figure 4 for Figure 3 An exploded schematic diagram of a battery cell is shown.

[0059] Figure 5 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application.

[0060] Figure 6 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application.

[0061] Figure 7 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application.

[0062] Figure 8 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application.

[0063] Fig. 9 For along Figure 8 Sectional view along line AA.

[0064] Fig.10 For along Figure 8 Sectional view along the midline BB.

[0065] Fig.11 A schematic diagram of the structure of a battery unit provided for some embodiments of the present application.

[0066] Fig.12Schematic diagram of the exploded structure of a battery provided for some embodiments of the present application.

[0067] Fig.13 Schematic diagram of the exploded structure of a battery provided for some embodiments of the present application.

[0068] Fig.14 Schematic diagram of the exploded structure of a battery provided for some embodiments of the present application.

[0069] Fig.15 for Fig.11 A partial enlarged view of point C in the middle.

[0070] Fig.16 The battery cell provided in some embodiments of the present application is Fig.11 A partial enlarged view of point C in the middle.

[0071] Fig.17 The battery cell provided in some embodiments of the present application is Fig.11 A partial enlarged view of point C in the middle.

[0072] Fig.18 for Fig.14 A partial enlarged view of point D in the middle.

[0073] Fig.19 The electrode assembly in the battery cell provided in some embodiments of the present application is Fig.11 A partial enlarged layout diagram at point C in the middle.

[0074] Fig. 20 An arrangement diagram of electrode assemblies in a battery cell provided for some embodiments of the present application.

[0075] Fig.21 An arrangement diagram of electrode assemblies in a battery cell provided for some embodiments of the present application.

[0076] Fig. 22 An arrangement diagram of electrode assemblies in a battery cell provided for some embodiments of the present application.

[0077] Fig.23 An arrangement diagram of electrode assemblies in a battery cell provided for some embodiments of the present application.

[0078] Fig.24 An arrangement diagram of electrode assemblies in a battery cell provided for some embodiments of the present application.

[0079] Fig.25 An arrangement diagram of electrode assemblies in a battery cell provided for some embodiments of the present application.

[0080] Among them, the reference numerals in the figure are:

[0081] 1000, vehicle; 1100, battery; 1101, battery unit; 1200, controller; 1300, motor; 100, battery cell; 1001, first battery cell; 1002, second battery cell; 1003, battery pack; 1004, first battery sub-unit; 1005, second battery sub-unit; 1006, third battery sub-unit; 1007, fourth battery sub-unit; 1008, fifth battery sub-unit; 1009, sixth battery sub-unit; 110, housing; 111. Shell; 112. End cover; 113. First side wall; 114. Second side wall; 115. Third side wall; 116. Fourth side wall; 120. Electrode assembly; 121. Large surface; 131. First electrode terminal; 132. Second electrode terminal; 140. Pressure relief mechanism; 200. Box; 210. First part; 220. Second part; 300. Exhaust part: 310. Exhaust channel; 320. Through hole; 400. Structural beam; 500. Buffer part; 600. Heat exchange part. DETAILED DESCRIPTION

[0082] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0083] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0084] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0085] Reference to "embodiments" herein means that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least some embodiments of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments in any suitable manner.

[0086] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0087] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces). "Several" means one or more than one, unless otherwise clearly and specifically defined.

[0088] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0089] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0090] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0091] At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0092] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0093] A battery usually includes a case and multiple battery cells, which are placed in the case. However, in some cases, the battery cells are flat structures, such as square-shell battery cells. The length of such battery cells is greater than the width of the battery cells, which results in a single grouping of the battery cells in the case. This may lead to a large amount of free space in the case, limiting the volume energy density of the battery, making it difficult to meet the placement requirements of cases of certain sizes.

[0094] Based on this, an embodiment of the present application provides a battery cell, the outer shell of which is a prismatic structure, and the first side wall and the second side wall of the outer shell along its axial direction are square, that is, the outer shell of the battery cell is a quadrangular prism with a square shape. The battery cells can be flexibly grouped to meet the placement requirements of most boxes, and can also better utilize the space in the box to improve the volume energy density of the battery.

[0095] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0096] Batteries are widely used in various electronic devices, including mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools. Batteries are devices that can store and release electrical energy to provide the required power for these electronic devices. Batteries can also be energy storage devices. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0097] Electrical devices may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0098] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in some embodiments of the present application.

[0099] Please refer to Figure 1 The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 1100 is provided inside the vehicle 1000. The battery 1100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 1100 may be used to power the vehicle 1000. For example, the battery 1100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 1200 and a motor 1300. The controller 1200 is used to control the battery 1100 to power the motor 1300, for example, to meet the power requirements for starting, navigating and driving the vehicle 1000.

[0100] In some embodiments of the present application, the battery 1100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0101] Please refer to Figure 2As an embodiment of the battery 1100, the battery 1100 includes a box 200 and a battery cell 1101, and the battery cell 1101 is contained in the box 200. The box 200 is used to provide a storage space for the battery cell 1101, and the box 200 can adopt a variety of structures. In some embodiments, the box 200 may include a first part 210 and a second part 220, and the first part 210 and the second part 220 cover each other, and the first part 210 and the second part 220 jointly define a storage space for accommodating the battery cell 1101. The second part 220 may be a hollow structure with one end open, and the first part 210 may be a plate-like structure, and the first part 210 covers the open side of the second part 220, so that the first part 210 and the second part 220 jointly define a storage space; the first part 210 and the second part 220 may also be hollow structures with one side open, and the open side of the first part 210 covers the open side of the second part 220. Of course, the box body 200 formed by the first part 210 and the second part 220 can be in various shapes, such as a cylinder, a cuboid, etc.

[0102] In the battery 1100 , the battery unit 1101 may include a plurality of battery cells 100 . The plurality of battery cells 100 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the plurality of battery cells 100 are connected in both series and in parallel.

[0103] In some embodiments, multiple battery cells 100 can be directly connected in series, parallel or hybrid, and then the whole formed by the multiple battery cells 100 is accommodated in the box 200; of course, the battery 1100 can also be a battery module formed by connecting multiple battery cells 100 in series, parallel or hybrid, and then the multiple battery modules are connected in series, parallel or hybrid to form a whole and accommodated in the box 200. The battery 1100 can also include other structures, for example, the battery 1100 can also include a busbar component for realizing electrical connection between multiple battery cells 100.

[0104] In some embodiments, the battery cell 100 refers to the smallest unit constituting the battery 1100. The battery cell 100 may include a lithium-ion secondary battery 1100, a lithium-ion primary battery 1100, a lithium-sulfur battery 1100, a sodium-lithium-ion battery 1100, a sodium-ion battery 1100, a lithium metal battery 1100, or a magnesium-ion battery 1100, etc., which is not limited in the embodiments of the present application.

[0105] In some embodiments, a structural beam 400 is further provided in the box 200 to increase the structural strength of the box 200 and the reliability of the battery 1100. The structural beam 400 may be provided between two adjacent batteries 1100 or on the side of the battery unit 1101. The number of structural beams 400 may be multiple, and the multiple structural beams 400 may be arranged at intervals or crosswise. The structural beam 400 may be provided between two adjacent batteries 1100 to separate the battery cells 100 and improve the safety of the battery cells 100. The structural beam 400 may not be provided in the box 200. The battery cells 100 may be integrally formed into a battery unit 1101 by integrally gluing or gluing the bottom, thereby eliminating the structural beam 400.

[0106] In some embodiments, the battery 1100 further includes a buffer 500, which is located between two adjacent battery cells 100. The buffer 500 is elastic and can relieve stress and vibration between the battery cells 100, thereby improving the reliability and stability of the battery 1100. The buffer 500 can be made of plastic materials such as polyethylene or polypropylene.

[0107] In some embodiments, the battery 1100 further includes a heat exchanger 600, which is used to exchange heat with the battery cell 100, so as to control the battery cell 100 to be charged and discharged at a suitable temperature, thereby improving the reliability and stability of the battery 1100; the heat exchanger 600 can be located between two adjacent battery cells 100, or on the upper or lower side of the battery cell 100, so as to achieve heat exchange on the top or bottom surface of the battery cell 100. A flow channel for the flow of a heat exchange medium can be provided in the heat exchanger 600, and the heat exchange medium exchanges heat with the battery cell 100 during the flow in the flow channel, so as to achieve temperature control of the battery cell 100. The heat exchanger 600 can also be a component such as an electric heating rod or an electric cooling component.

[0108] In some embodiments, the battery 1100 may not include the housing 200 , but a plurality of battery cells 100 may be electrically connected and formed into a whole through necessary fixing structures and then assembled into an electrical device.

[0109] See also Figure 2 As shown, the battery 1100 has a height direction, a length direction and a width direction. The height direction of the battery 1100 can refer to the Z direction in the figure, the width direction of the battery 1100 can refer to the Y direction in the figure, and the length direction of the battery 1100 can refer to the X direction in the figure. The box 200 defines the outer structure of the battery 1100. The height direction of the box 200 can be the height direction of the battery 1100, the length direction of the box 200 is the length direction of the battery 1100, and the width direction of the box 200 is the width direction of the battery 1100.

[0110] In some embodiments of the present application, see Figure 3 and Figure 4 As shown, a battery cell 100 is provided, which includes a shell 110, an electrode assembly 120, a first electrode terminal 131 and a second electrode terminal 132; the electrode assembly 120 is arranged in the shell 110; the first electrode terminal 131 is electrically connected to the electrode assembly 120; the second electrode terminal 132 is electrically connected to the electrode assembly 120, and the polarities of the first electrode terminal 131 and the second electrode terminal 132 are different for outputting or inputting electric energy; wherein the shell 110 is a prismatic structure, and the shell 110 has a first side wall 113 and a second side wall 114 that are oppositely arranged along the axial direction, the first side wall 113 and the second side wall 114 are square, and at least one of the first electrode terminal 131 and the second electrode terminal 132 is arranged on the first side wall 113 or the second side wall 114.

[0111] The shell 110 refers to a shell 111 structure with a space inside to accommodate and protect the electrode assembly 120. The shell 110 can be made of a material with a certain hardness and strength, so that the shell 110 is not easily deformed when squeezed or collided, so that the battery cell 100 can have a higher structural strength and improved reliability. The shell 110 can be made of a variety of materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0112] The shell 110 is shaped like a prism. Among the two side walls of the shell 110 that are axially opposite to each other, one side wall is a first side wall 113 and the other side wall is a second side wall 114. The shapes of the first side wall 113 and the second side wall 114 are square, so that the shell 110 has a quadrangular prism structure.

[0113] For example: in order to reduce the edge of the housing 110, the edges of the housing 110 are usually rounded or chamfered, so that the corner edge of the first side wall 113 is straight or arc-shaped. In this case, the shape of the first side wall 113 can also be called a square. Similarly, in order to reduce the edge of the housing 110, the edges of the housing 110 are usually rounded or chamfered, so that the corner edge of the second side wall 114 is straight or arc-shaped. In this case, the shape of the second side wall 114 can also be called a square.

[0114] For example, during the manufacturing process of the shell 110, due to manufacturing errors, the width of the first side wall 113 may be equal to or nearly equal to the length of the first side wall 113. Therefore, when the ratio of the width of the first side wall 113 to the length of the first side wall 113 is in the range of 0.9 to 1.1, the shape of the first side wall 113 can also be called a square; similarly, when the ratio of the width of the second side wall 114 to the length of the second side wall 114 is in the range of 0.9 to 1.1, the shape of the second side wall 114 can also be called a square.

[0115] See also Figure 3 As shown, the battery cell 100 has a height direction, a width direction and a length direction. The height direction of the battery cell 100 can refer to the Z1 direction in the figure, the width direction of the battery cell 100 can refer to the X1 direction in the figure, and the length direction of the battery cell 100 can refer to the Y1 direction in the figure. The shell 110 defines the outer structure of the battery cell 100. The height direction of the shell 110 can be the height direction of the battery cell 100, the length direction of the shell 110 is the length direction of the battery cell 100, and the width direction of the shell 110 is the width direction of the battery cell 100. The axial direction of the housing 110 can refer to the Z1 direction in the figure. The first side wall 113 and the second side wall 114 refer to the upper and lower side walls of the battery cell 100, respectively. The first side wall 113 and the second side wall 114 are square, that is, the width of the first side wall 113 is equal to or nearly equal to the length of the first side wall 113. The width of the first side wall 113 can also be referred to as the length of the first side wall 113, the length of the first side wall 113 can also be referred to as the width of the first side wall 113, the width direction of the first side wall 113 can also be referred to as the length direction of the first side wall 113, and the length direction of the first side wall 113 can also be referred to as the width direction of the first side wall 113. The width of the first side wall 113 The width of the first side wall 114 may be the width of the battery cell 100, and the length of the first side wall 113 may be the length of the battery cell 100; similarly, the width of the second side wall 114 is equal to or nearly equal to the length of the second side wall 114, the width of the second side wall 114 may also be referred to as the length of the second side wall 114, the length of the second side wall 114 may also be referred to as the width of the second side wall 114, the width direction of the second side wall 114 may also be referred to as the length direction of the second side wall 114, and the length direction of the second side wall 114 may also be referred to as the width direction of the second side wall 114; the width of the second side wall 114 may be the width of the battery cell 100, and the length of the second side wall 114 may be the length of the battery cell 100.

[0116] The electrode assembly 120 is a component in the battery cell 100 where an electrochemical reaction occurs. One or more electrode assemblies 120 may be contained in the housing 110. The electrode assembly 120 is composed of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell 100 mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode collector, the positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer, and the positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear.

[0117] Taking the lithium-ion battery 1100 as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, lithium metal or lithium alloy, etc. In order to ensure that a large current passes without melting, the number of positive electrode ears is multiple and stacked together, and the number of negative electrode ears is multiple and stacked together. The material of the isolation film may be polypropylene (PP) or polyethylene (PE), etc. In addition, the electrode assembly 120 in the embodiment of the present application includes but is not limited to a winding structure or a laminated structure.

[0118] The electrode terminal refers to a conductive member provided on the housing 110. The electrode terminal is connected to the tab of the electrode assembly 120 to output the electrical energy of the battery cell 100 or charge the battery cell 100. The battery cell 100 generally has two electrode terminals, which are respectively connected to the positive and negative tabs of the electrode assembly 120. The electrode terminal connected to the positive tab is the positive electrode terminal, and the electrode terminal connected to the negative tab is the negative electrode terminal. The positive electrode terminal and the negative electrode terminal can be connected to the busbar component to achieve electrical connection between multiple battery cells 100. Among them, one of the first electrode terminal 131 and the second electrode terminal 132 is the positive electrode terminal, and the other is the negative electrode terminal.

[0119] At least one of the first electrode terminal 131 and the second electrode terminal 132 is disposed on the first side wall 113 or the second side wall 114 ; it can be understood that the first electrode terminal 131 is disposed on the first side wall 113 or the second side wall 114 , and the second electrode terminal 132 is disposed on the first side wall 113 or the second side wall 114 .

[0120] See also Figure 3 , Figure 5 and Figure 6As shown, the first electrode terminal 131 is arranged on the first side wall 113, and the second electrode terminal 132 may be arranged on the first side wall 113, the second side wall 114 or on a side wall adjacent to the first side wall 113; the first electrode terminal 131 is arranged on the second side wall 114, and the second electrode terminal 132 may be arranged on the first side wall 113, the second side wall 114 or on a side wall adjacent to the first side wall 113; the second electrode terminal 132 is arranged on the first side wall 113, and the first electrode terminal 131 may be arranged on the first side wall 113, the second side wall 114 or on a side wall adjacent to the first side wall 113; the second electrode terminal 132 is arranged on the second side wall 114, and the first electrode terminal 131 may be arranged on the first side wall 113, the second side wall 114 or on a side wall adjacent to the first side wall 113.

[0121] When the battery cell 100 of the embodiment of the present application is in use, the external electronic device is electrically connected to the first electrode terminal 131 and the second electrode terminal 132 to form a circuit loop, and the electrode assembly 120 in the shell 110 undergoes an electrochemical reaction, thereby realizing the input and output of electrical energy of the battery cell 100; the shell 110 is a prismatic structure, and the first side wall 113 and the second side wall 114 of the shell 110 arranged along the axial direction are square, that is, the shell 110 is a quadrangular prism structure, and the shape of the battery cell 100 is square. The battery cell 100 can be flexibly grouped, which can meet the placement requirements of most of the boxes 200, and can also better utilize the space in the box 200 to improve the volume energy density of the battery 1100; in addition, in the process of grouping the battery cells 100, there is no need to distinguish the length and width directions of the battery cells 100, which is conducive to improving the assembly efficiency of the battery cells 100.

[0122] When the battery cell 100 is charged, the current converts electrical energy into chemical energy through the chemical reaction between the electrolyte and the electrode and stores it in the battery cell 100. During the discharge process, the chemical energy is converted into electrical energy and released. This energy conversion process is accompanied by energy loss and heat generation. If the heat dissipation inside the battery cell 100 is poor and the heat cannot be effectively dissipated, the battery cell 100 will overheat. There is a certain internal resistance inside the battery cell 100. When the current passes through the internal resistance, resistance loss will be generated, causing the battery cell 100 to heat up. When the current is too large or the internal resistance is too high, the heat inside the battery cell 100 will increase, causing the battery cell 100 to overheat. If the battery cell 100 exceeds its designed maximum voltage during charging, or the battery cell 100 voltage drops too low during discharge, it will cause the battery cell 100 to overvoltage or overdischarge. Overcharging or overdischarging will cause the chemical reaction inside the battery cell 100 to get out of control, generate too much heat, and cause the battery cell 100 to overheat. In addition, there may be defects in the design or manufacturing process of the battery cell 100, such as improper material selection, poor assembly of the battery cell 100, etc. These defects may lead to poor heat dissipation or uneven current distribution inside the battery cell 100, thereby increasing the risk of overheating or overvoltage of the battery cell 100. Therefore, the battery cell 100 may overheat or overvoltage during charging or use.

[0123] The battery cell 100 usually contains a certain amount of gas inside. When the battery cell 100 is charged or discharged, the solution in the electrolyte will produce or absorb gas. The generation of these gases will cause the gas pressure inside the battery cell 100 to increase, causing the battery cell 100 to swell and deform. During the charging or discharging process of the battery cell 100, the positive and negative electrode materials will undergo chemical reactions to form new compounds. These chemical reactions are accompanied by changes in volume, which cause the volume of the materials inside the battery cell 100 to change, causing the battery 1100 to swell and deform. When the battery cell 100 is overcharged or over-discharged, the chemical reaction inside the battery cell 100 will be out of control, generating too much gas or causing the structure of the electrode material to be damaged, which will cause the battery cell 100 to swell and deform. Charging or discharging the battery cell 100 in a high temperature environment will accelerate the internal chemical reaction, increase the generation of gas and the change in volume. High temperature will also cause the expansion of the material inside the battery cell 100, which will also cause the battery cell 100 to swell and deform.

[0124] In order to reduce the risk of explosion or fire caused by overheating or overpressure of the battery cell 100 during charging or use, a pressure relief mechanism 140 such as an explosion-proof valve or explosion-proof plate is often provided on the shell 110 of the battery cell 100, so that when the temperature or pressure of the battery cell 100 exceeds the safety threshold, the gas or liquid inside the battery cell 100 can be released to reduce the pressure inside the battery cell 100 and reduce the risk of explosion of the battery cell 100. This can improve the safety performance of the battery cell 100 and reduce potential safety risks.

[0125] In other embodiments of the present application, see Figure 7 and Figure 8 As shown, the first electrode terminal 131 and the second electrode terminal 132 are disposed on the first side wall 113 , and the angle between the arrangement direction of the first electrode terminal 131 and the second electrode terminal 132 and the length direction of the first side wall 113 is α, wherein 0°≤α≤45°.

[0126] Here, it can be understood that the first electrode terminal 131 and the second electrode terminal 132 are arranged at intervals on the first side wall 113, which can reduce the risk of short circuit; the arrangement direction of the first electrode terminal 131 and the second electrode terminal 132 can be parallel to the line connecting the center of the first electrode terminal 131 and the center of the second electrode terminal 132, and the angle formed by the line and the length direction of the first side wall 113 is α; wherein the arrangement direction of the first electrode terminal 131 and the second electrode terminal 132 can refer to Figure 7 The direction indicated by arrow A.

[0127] 0°≤α≤45°. It can be understood that the value of α can be 0°, 45° or any value between 0° and 45°. For example, the value of α can be but is not limited to 0°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°.

[0128] By adopting the technical solution of this embodiment, since 0°≤α≤45° and the first side wall 113 is a square, the length direction of the first side wall 113 can also be called the width direction of the first side wall 113, so the first electrode terminal 131 and the second electrode terminal 132 can be flexibly arranged on the first side wall 113 to meet the needs of different battery cells 100; in addition, the first electrode terminal 131 and the second electrode terminal 132 are simultaneously arranged on the first side wall 113, which can facilitate the electrical connection between the battery cell 100 and the busbar component.

[0129] For example, see Figure 8 As shown, the arrangement direction of the first electrode terminal 131 and the second electrode terminal 132 is parallel to the length direction of the first side wall 113 and is located in the middle position of the width direction of the first side wall 113 .

[0130] In other embodiments of the present application, see Figure 7 As shown, the first electrode terminal 131 and the second electrode terminal 132 are respectively located at two opposite corners of the first side wall 113 .

[0131] Here, it can be understood that the first electrode terminal 131 and the second electrode terminal 132 are located at two corners of the first side wall 113 distributed along a diagonal line.

[0132] By adopting the technical solution of this embodiment, the distance between the first electrode terminal 131 and the second electrode terminal 132 is far, so that a large pressure relief mechanism 140 or multiple pressure relief mechanisms 140, such as a double pressure relief mechanism 140, can be set between the first electrode terminal 131 and the second electrode terminal 132, thereby improving the pressure relief effect and the reliability of the battery 1100; at the same time, the distance between the pressure relief mechanism 140 and the first electrode terminal 131 or the second electrode terminal 132 can also be set larger, which can also reduce the impact of the emissions released by the pressure relief mechanism 140 on the electrode terminals and the busbar, thereby improving the reliability of the battery 1100. In addition, in the process of grouping multiple battery cells 100, the adjacent corners of adjacent battery cells 100 can also be centrally set with the first electrode terminal 131 or the second electrode terminal 132 to facilitate the electrical connection between the battery cell 100 and the busbar.

[0133] In other embodiments of the present application, see Figure 7 and Figure 8 As shown, the first electrode terminal 131 and the second electrode terminal 132 are disposed on the first side wall 113, and the first side wall 113 is provided with at least one pressure relief mechanism 140 for releasing emissions; and / or, the second side wall 114 is provided with at least one pressure relief mechanism 140 for releasing emissions.

[0134] In a possible implementation, the first electrode terminal 131, the second electrode terminal 132, and at least one pressure relief mechanism 140 are disposed on the first side wall 113, so that the first electrode terminal 131, the second electrode terminal 132, and the pressure relief mechanism 140 can be installed on the same side wall of the housing 110, and the processing and manufacturing are simple. The number of the pressure relief mechanisms 140 on the first side wall 113 can be one or more; for example: two, three, or four.

[0135] In another possible implementation, the first electrode terminal 131 and the second electrode terminal 132 are disposed on the first side wall 113, and at least one pressure relief mechanism 140 is disposed on the second side wall 114, so that the electrode terminals and the pressure relief mechanism 140 are disposed on opposite sides of the housing 110, which can reduce the impact of the discharge discharged by the pressure relief mechanism 140 on the first electrode terminal 131 and the second electrode terminal 132, and is conducive to improving the reliability of the battery cell 100. The number of pressure relief mechanisms 140 on the second side wall 114 can be one or more; for example: two, three, or four.

[0136] In another possible embodiment, the first electrode terminal 131 and the second electrode terminal 132 are arranged on the first side wall 113, and the first side wall 113 and the second side wall 114 are both provided with at least one pressure relief mechanism 140, so that pressure can be relieved from two opposite sides of the battery cell 100, there are many pressure relief positions, and the pressure relief effect is good, which is beneficial to improving the reliability of the battery cell 100.

[0137] By adopting the technical solution of this embodiment, the position of the pressure relief mechanism 140 can be flexibly arranged to meet different usage requirements.

[0138] In some embodiments, the pressure relief mechanism 140 may have various shapes, such as a strip, a circle, etc.

[0139] In some cases, after multiple battery cells 100 are grouped, due to the placement direction of the battery cells 100, some battery cells 100 have their long strips of pressure relief mechanisms 140 arranged vertically, while some battery cells 100 have their long strips of pressure relief mechanisms 140 arranged horizontally. The arrangement of the pressure relief mechanisms 140 is inconsistent, which increases the difficulty of designing the subsequent pressure relief channels connected to the pressure relief mechanisms 140.

[0140] In other embodiments of the present application, see Figure 7 and Figure 8 As shown, the pressure relief mechanism 140 includes a circular pressure relief mechanism 140 .

[0141] Here, it can be understood that the circular pressure relief mechanism 140 may mean that the shape of the pressure relief mechanism 140 is circular.

[0142] By adopting the technical solution of this embodiment, after multiple battery cells 100 are grouped, the circular pressure relief mechanism 140 will not change due to the different placement of the battery cells 100; the circular pressure relief mechanism 140 has good consistency in position, which is conducive to reducing the difficulty of designing the subsequent pressure relief channel connected to the pressure relief mechanism 140.

[0143] In other embodiments of the present application, see Figure 4 As shown, the electrode assembly 120 is a flat structure.

[0144] Here, it can be understood that the electrode assembly 120 is flat. Generally, the electrode assembly 120 is a flat structure, and the outer shell 110 of the battery cell 100 is also a flat structure, which makes the length and width of the battery cell 100 differ greatly, and makes it difficult for the battery cell 100 to meet the placement requirements of a box 200 of some sizes.

[0145] See also Figure 4 As shown, the electrode assembly 120 has a height direction, a width direction and a length direction. The height direction of the electrode assembly 120 may be parallel to the height direction of the battery cell 100, which can be referred to as the Z1 direction in the figure. The width direction of the electrode assembly 120 may be parallel to the width direction of the battery cell 100, which can be referred to as the X1 direction in the figure. The length direction of the electrode assembly 120 may be parallel to the length direction of the battery cell 100, which can be referred to as the Y1 direction in the figure. The two end faces of the electrode assembly 120 along its height direction are respectively the first end face and the second end face, that is, the height of the electrode assembly 120 is defined between the first end face and the second end face. The surface located on the side of the electrode assembly 120 in the height direction is the side face of the electrode assembly 120, and the side face includes two first side faces located at both ends of the length direction of the electrode assembly 120 and two second side faces located at both ends of the width direction, that is, the distance between the two first side faces is the length of the electrode assembly 120, and the distance between the two second side faces is the width of the electrode assembly 120. The areas of the two end faces are defined by the length and width of the electrode assembly 120, the area of ​​the first side face is defined by the height and width of the electrode assembly 120, and the area of ​​the second side face is defined by the height and length of the electrode assembly 120. For a flat electrode assembly 120, its width is smaller than its length and height, and its second side face has the largest area, so the second side face is also called a large face 121, and the large face 121 is also perpendicular to the first side wall 113 and the second side wall 114. Among them, the tab is led out from the first end face, and the first electrode terminal 131 and the second electrode terminal 132 are located on the side of the electrode assembly 120 close to the first end face.

[0146] By adopting the technical solution of this embodiment, the electrode assembly 120 has a flat structure, but the shell 111 of the battery cell 100 is a quadrangular prism. The shape of the battery cell 100 is square, which can meet the placement requirements of most boxes 200, and can also better utilize the space in the box 200 to improve the volume energy density of the battery 1100; in addition, in the process of assembling the battery cells 100 into the battery 1100, there is no need to distinguish the length and width directions of the battery cells 100, which is conducive to improving the assembly efficiency of the battery cells 100.

[0147] In other embodiments of the present application, see Figures 8 to 10As shown, the shell 110 also has a third side wall 115 and a fourth side wall 116 parallel to and adjacent to the axial direction. The surface with the largest area of ​​the electrode assembly 120 is the large surface 121. The third side wall 115 is arranged opposite to the large surface 121. The thickness H1 of the third side wall 115 is greater than the thickness H2 of the fourth side wall 116.

[0148] See also Figure 4 As shown, the first side wall 113 and the second side wall 114 define the height of the battery cell 100, the two side walls at both ends of the length direction of the battery cell 100 are the third side walls 115, and the two third side walls 115 define the length of the battery cell 100, and the two side walls at the width direction of the battery cell 100 are the fourth side walls 116, and the two fourth side walls 116 define the width of the battery cell 100. For the flat electrode assembly 120, its width is smaller than its length and height, and its second side surface has the largest area, so the second side surface is also called the large surface 121, and the side walls of the housing 110 located on the large surface 121 along the height direction of the electrode assembly 120 are the first side wall 113 and the second side wall 114, respectively, the large surface 121 and the third side wall 115 are arranged opposite to each other, and the side walls located on the large surface 121 along the length direction of the electrode assembly 120 are the fourth side walls 116.

[0149] The thickness H1 of the third side wall 115 may refer to the distance between two surfaces of the third side wall 115 along the width direction of the battery cell 100 ; the thickness H2 of the fourth side wall 116 may refer to the distance between two surfaces of the fourth side wall 116 along the length direction of the battery cell 100 .

[0150] By adopting the technical solution of this embodiment, during the charge and discharge process of the battery cell 100, the large surface 121 of the electrode assembly 120 expands most significantly, and the large surface 121 of the electrode assembly 120 is opposite to the third side wall 115, so that the third side wall 115 can limit the expansion of the electrode assembly 120, and the thickness H1 of the third side wall 115 is greater than the thickness H2 of the fourth side wall 116. The thickness H1 of the third side wall 115 is thicker, and the effect of limiting the expansion of the electrode assembly 120 is better, which is beneficial to improving the reliability of the battery cell 100.

[0151] In some embodiments, see Fig. 9As shown, the pressure relief mechanism 140 is disposed on the first side wall 113, and the thickness H3 of the first side wall 113 is greater than the thickness H1 of the third side wall 115. The thickness H3 of the first side wall 113 is relatively thick, and the first side wall 113 and the pressure relief mechanism 140 are more easily connected. For example: the pressure relief mechanism 140 is welded to the first side wall 113, and the thickness H3 of the first side wall 113 is relatively thick, and it is not easy to weld through the first side wall 113, and it is easier to weld the pressure relief mechanism 140 and the first side wall 113; for example: the pressure relief mechanism 140 is manufactured on the first side wall 113 by notching, stamping or laser etching, and the thickness H3 of the first side wall 113 is relatively thick, and it is not easy to penetrate the first side wall 113, and it is easier to notch, stamp and laser etch the pressure relief mechanism 140.

[0152] Similarly, the pressure relief mechanism 140 is disposed on the second side wall 114, and the thickness H4 of the second side wall 114 is greater than the thickness H1 of the third side wall 115. The thickness H4 of the second side wall 114 is thicker, and the second side wall 114 is easier to connect with the pressure relief mechanism 140. For example: the pressure relief mechanism 140 is welded to the second side wall 114, and the thickness H4 of the second side wall 114 is thicker, so it is not easy to weld through the second side wall 114, and it is easier to weld the pressure relief mechanism 140 to the second side wall 114; for example: the pressure relief mechanism 140 is manufactured on the second side wall 114 by notching, stamping or laser etching, and the thickness H4 of the second side wall 114 is thicker, so it is not easy to penetrate the second side wall 114, and it is easier to notch, stamp and laser etch the pressure relief mechanism 140.

[0153] In other embodiments of the present application, see Figure 4 As shown, the housing 110 includes a shell 111 and an end cover 112, the end cover 112 covers the opening of the shell 111, the end cover 112 forms a first side wall 113, and the side walls of the shell 111 and the end cover 112 opposite to each other form a second side wall 114; or, the end cover 112 forms the second side wall 114, and the side walls of the shell 111 and the end cover 112 opposite to each other form the first side wall 113.

[0154] The end cap 112 refers to a component that covers the opening of the shell 111 to isolate the internal environment of the battery cell 100 from the external environment. Without limitation, the shape of the end cap 112 can be adapted to the shape of the shell 111 to match the shell 111. Optionally, the end cap 112 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 112 is not easily deformed when squeezed and collided, so that the battery cell 100 can have a higher structural strength and the safety performance can also be improved.

[0155] The material of the end cap 112 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the present embodiment. In some embodiments, an insulating member can be provided on the inner side of the end cap 112, and the insulating member can be used to isolate the electrical connection components in the housing 111 from the end cap 112 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0156] The shell 111 is a component used to cooperate with the end cap 112 to form the internal environment of the battery cell 100, wherein the formed internal environment can be used to accommodate the electrode assembly 120. The shell 111 and the end cap 112 can be independent components, and an opening can be set on the shell 111, and the internal environment of the battery cell 100 is formed by covering the opening with the end cap 112 at the opening. Without limitation, the end cap 112 and the shell 111 can also be integrated. Specifically, the end cap 112 and the shell 111 can form a common connection surface before other components are put into the shell, and when the interior of the shell 111 needs to be encapsulated, the end cap 112 is covered with the shell 111. The material of the shell 111 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0157] The end cover 112 forms a first side wall 113 , and the side wall of the shell 111 opposite to the end cover 112 forms a second side wall 114 . It can be understood that the shape of the end cover 112 is a positive direction, and the shape of the shell 111 is a quadrangular prism.

[0158] The end cap 112 forms a second side wall 114, and the side wall of the housing 111 opposite to the end cap 112 forms a first side wall 113. It can be understood that the shape of the end cap 112 is a positive direction, and the shape of the housing 111 is a quadrangular prism. At least one of the first electrode terminal 131 and the second electrode terminal 132 is disposed on the end cap 112.

[0159] By adopting the technical solution of this embodiment, the outer shell 110 adopts the structure of the shell 111 and the end cover 112, so that the electrode assembly 120 can be installed into the shell 111 from the opening of the shell 111, and then the end cover 112 is covered on the opening of the shell 111. The operation of inserting the electrode assembly 120 into the shell is simple and the assembly is convenient.

[0160] The battery cell 100 according to the embodiment of the present application is described in conjunction with some specific embodiments.

[0161] Embodiment 1

[0162] In this embodiment, see Figure 3 , Figure 4 as well as Figures 8 to 10As shown, the battery cell 100 includes a shell 110, an electrode assembly 120, a first electrode terminal 131 and a second electrode terminal 132; the electrode assembly 120 is arranged in the shell 110; the first electrode terminal 131 is electrically connected to the electrode assembly 120; the second electrode terminal 132 is electrically connected to the electrode assembly 120, and the polarities of the first electrode terminal 131 and the second electrode terminal 132 are different for outputting or inputting electric energy; wherein the shell 110 is a prismatic structure, and the shell 110 has a first side wall 113 and a second side wall 114 that are oppositely arranged along the axial direction, the first side wall 113 and the second side wall 114 are square, and at least one of the first electrode terminal 131 and the second electrode terminal 132 is arranged on the first side wall 113 or the second side wall 114.

[0163] In this embodiment, the housing 110 includes a shell 111 and an end cover 112 . The end cover 112 covers the opening of the shell 111 . The end cover 112 forms a first side wall 113 . The side wall of the shell 111 opposite to the end cover 112 forms a second side wall 114 .

[0164] In this embodiment, the first electrode terminal 131 and the second electrode terminal 132 are disposed on the first side wall 113 , and the first side wall 113 is provided with at least one pressure relief mechanism 140 for releasing exhaust.

[0165] In this embodiment, the shell 110 also has a third side wall 115 and a fourth side wall 116 that are parallel to and adjacent to the axial direction. The surface with the largest area of ​​the electrode assembly 120 is the large surface 121. The third side wall 115 is arranged opposite to the large surface 121, and the thickness H1 of the third side wall 115 is greater than the thickness H2 of the fourth side wall 116.

[0166] In this embodiment, the electrode assembly 120 is a flat structure.

[0167] In this embodiment, the first electrode terminal 131 and the second electrode terminal 132 are disposed on the first side wall 113 , and the angle between the arrangement direction of the first electrode terminal 131 and the second electrode terminal 132 and the length direction of the first side wall 113 is α, where 0°≤α≤45°.

[0168] In the present embodiment, α=0°, and the first electrode terminal 131 and the second electrode terminal 132 are located in the middle of the first side wall 113 in the width direction.

[0169] Embodiment 2

[0170] The difference between the second embodiment and the first embodiment is that: Figure 7 As shown, the first electrode terminal 131 and the second electrode terminal 132 are respectively located at two opposite corners of the first side wall 113 .

[0171] Embodiment 3

[0172] The difference between the second embodiment and the first embodiment is that: Figure 5 As shown, the first electrode terminal 131 is disposed on the first side wall 113 , and the second electrode terminal 132 is disposed on the third side wall 115 .

[0173] Embodiment 4

[0174] The difference between the fourth embodiment and the first embodiment is that: Figure 6 As shown, the first electrode terminal 131 is disposed on the first side wall 113 , and the second electrode terminal 132 is disposed on the second side wall 114 .

[0175] In other embodiments of the present application, see Figure 2 As shown, a battery 1100 is provided, including a battery unit 1101 , wherein the battery unit 1101 includes at least one battery cell 100 as described in the above embodiment.

[0176] The battery 1100 of the embodiment of the present application adopts the above-mentioned battery cells 100. The battery cells 100 are more flexibly grouped, which can meet the use requirements of batteries 1100 of different sizes, and is also beneficial to improving the volume energy density of the battery 1100, and is also beneficial to improving the assembly efficiency of the battery 1100.

[0177] In other embodiments of the present application, see Fig.11 As shown, the battery unit 1101 includes at least one layer of battery cells 100 , and each layer of battery cells 100 includes a plurality of battery cells 100 arranged in a matrix along a first direction and a second direction, and the first direction is perpendicular to the second direction.

[0178] The battery cell 100 includes at least one layer of battery cells 100 , which may mean that the battery unit 1101 includes one or more layers of battery cells 100 , which may be specifically selected according to the capacity and size of the battery 1100 required by the battery 1100 .

[0179] A plurality of battery cells 100 are arranged in a matrix along a first direction X and a second direction Y. It can be understood that the plurality of battery cells 100 can be arranged in a plurality of rows, and the number of battery cells 100 in each row is the same; for example, a plurality of battery cells 100 arranged along the first direction is called a row of battery cells 100; a plurality of battery cells 100 can also be arranged in a plurality of columns, and the number of battery cells 100 in each column is the same; for example, a plurality of battery cells 100 arranged along the second direction is called a column of battery cells 100.

[0180] See also Figure 2 As shown, the first direction may refer to a direction extending along an edge of the box body 200 , and the second direction is perpendicular to the first direction. For example, the first direction may refer to the width direction of the battery 1100 , and the second direction may refer to the length direction of the battery 1100 .

[0181] By adopting the technical solution of this embodiment, multiple battery cells 100 are arranged in a matrix along the first direction and the second direction, and the battery cells 100 are in the form of quadrangular prisms. There is no need to distinguish the grouping directions of the battery cells 100 during assembly, and a relatively regular battery unit 1101 can be formed, which has higher assembly efficiency.

[0182] In other embodiments of the present application, see Figure 2 and Fig.11 As shown, the first electrode terminal 131 and the second electrode terminal 132 are arranged on the first side wall 113, and the first side wall 113 is perpendicular to the third direction. In the same layer of battery cells 100, all first side walls 113 are located on the same side of the corresponding layer of battery cells 100, and the first direction and the second direction are perpendicular to the third direction.

[0183] The third direction is perpendicular to the first direction, and the third direction is perpendicular to the second direction, for example: Figure 2 and Fig.11 As shown, the third direction may refer to a height direction of the battery cell 100 .

[0184] The first side wall 113 is perpendicular to the third direction. It can be understood that the first side wall 113 is parallel to the first direction and the second direction.

[0185] In the same layer of battery cells 100, all the first side walls 113 are located on the same side of the corresponding layer of battery cells 100, and the first direction and the second direction are perpendicular to the third direction. It can be understood that in the same layer of battery cells 100, the first side walls 113 of all the battery cells 100 are exposed outside the corresponding layer of battery cells 100 and are located on the same side of the corresponding layer of battery cells 100, that is, the first electrode terminals 131 and the second electrode terminals 132 of all the battery cells 100 are located on the same side of the corresponding layer of battery cells 100 and exposed outside the corresponding layer of battery cells 100.

[0186] By adopting the technical solution of this embodiment, the first electrode terminals 131 and the second electrode terminals 132 of all the battery cells 100 are located on the same side of the corresponding layer of battery cells 100, so that the first electrode terminals 131 and the second electrode terminals 132 can be exposed outside the corresponding layer of battery cells 100, which facilitates the connection between the first electrode terminals 131 and the second electrode terminals 132 and the busbar components, and facilitates the electrical connection between the battery cells 100.

[0187] In other embodiments of the present application, see Figures 12-14 As shown, the first electrode terminal 131 and the second electrode terminal 132 are disposed on the first side wall 113 , and the first side wall 113 is perpendicular to the first direction.

[0188] The first side wall 113 is perpendicular to the first direction. It can be understood that in the same layer of battery cells 100, the first side wall 113 is arranged toward the battery cells 100 in an adjacent column or is arranged away from the battery cells 100 in an adjacent column, that is, the first electrode terminal 131 and the second electrode terminal 132 are arranged on one side of the battery cell 100 along the second direction.

[0189] By adopting the technical solution of this embodiment, the first electrode terminal 131 and the second electrode terminal 132 are arranged on one side of the battery cell 100 along the second direction, which is conducive to arranging multiple layers of battery cells 100.

[0190] In other embodiments of the present application, see Figures 12-14 As shown, in the same layer of battery cells 100, each two adjacent columns of battery cells 100 arranged along the second direction form a battery group 1003; in the same battery group 1003, the first side walls 113 of two battery cells 100 arranged along the first direction are arranged back to back or facing each other.

[0191] In the same layer of battery cells 100, every two adjacent columns of battery cells 100 arranged along the second direction form a battery group 1003; it can be understood that a battery group 1003 includes two columns of battery cells 100 arranged along the second direction, and these two columns of battery cells 100 are arranged adjacent to each other; in multiple battery groups 1003, two adjacent battery groups 1003 do not include the same column of battery groups 1003, that is, two adjacent battery groups 1003 include four adjacent columns of battery cells 100; for example: a layer of battery cells 100 includes 6 columns of battery cells 100, and the 6 columns of battery cells 100 are divided into 3 battery groups 1003.

[0192] In the same battery group 1003, the first side walls 113 of the two battery cells 100 arranged along the first direction are arranged back to back. It can be understood that, in the same group of battery groups 1003, the first side walls 113 of the two battery cells 100 arranged along the second direction are located at the opposite ends of the same group of battery groups 1003 along the second direction, so that in two adjacent battery groups 1003, the first side walls 113 of the two middle columns of battery cells 100 are arranged face to face and spaced apart.

[0193] The first side walls 113 of the two battery cells 100 arranged along the first direction are arranged face to face. It can be understood that, in the same group of battery packs 1003, the first side walls 113 of the two battery cells 100 arranged along the second direction are located in the middle position of the two battery cells 100, that is, the first side walls 113 of the two columns of battery cells 100 in the middle are arranged face to face and spaced apart.

[0194] By adopting the technical solution of this embodiment, in the same layer of battery cells 100, the first side walls 113 of two columns of battery cells 100 can be arranged facing each other, so that the first electrode terminals 131 and the second electrode terminals 132 of the two columns of battery cells 100 can be arranged facing each other, so that the busbar component can connect the two columns of battery cells 100 at the same time. In addition, the gap between the two columns of battery cells 100 can also be reduced, thereby improving the structural compactness of the battery 1100.

[0195] In other embodiments of the present application, see Figures 15 to 17 As shown, the arrangement directions of the first electrode terminals 131 and the second electrode terminals 132 of two adjacent battery cells 100 are perpendicular or parallel.

[0196] Here, it can be understood that in the same row of battery cells 100, the arrangement directions of the first electrode terminals 131 and the second electrode terminals 132 of two adjacent battery cells 100 are vertical or parallel; or, in the same column of battery cells 100, the arrangement directions of the first electrode terminals 131 and the second electrode terminals 132 of two adjacent battery cells 100 are vertical or parallel; or, in two adjacent layers of battery cells 100, the arrangement directions of the first electrode terminals 131 and the second electrode terminals 132 of two battery cells 100 arranged vertically or parallel.

[0197] In a possible implementation, the first electrode terminals 131 and the second electrode terminals 132 of two adjacent battery cells 100 are arranged perpendicularly. The electrode terminals of two adjacent battery cells 100 can be distributed farther apart with different polarities, which is beneficial to reduce the risk of short circuit.

[0198] In another possible implementation, the first electrode terminals 131 and the second electrode terminals 132 of two adjacent battery cells 100 are arranged in parallel, and the electrode terminals of the same polarity of the two adjacent battery cells 100 may be arranged closer to facilitate electrical connection.

[0199] By adopting the technical solution of this embodiment, the positions of the electrode terminals can be flexibly distributed to meet different usage requirements.

[0200] In other embodiments of the present application, see Fig.17 As shown, the adjacent corners of four adjacent battery cells 100 are each provided with a first electrode terminal 131 or a second electrode terminal 132 .

[0201] Here, it can be understood that the corners of the first electrode terminals 131 in four adjacent battery cells 100 are arranged close to each other, or the corners of the second electrode terminals 132 in four adjacent battery cells 100 are arranged close to each other.

[0202] By adopting the technical solution of this embodiment, the adjacent corners of four adjacent battery cells 100 are each provided with a first electrode terminal 131 or a second electrode terminal 132, so that electrode terminals with the same polarity are concentratedly distributed, which can facilitate the connection of the first electrode terminal 131 or the second electrode terminal 132 with the busbar component.

[0203] In other embodiments of the present application, see Fig.14 and Fig.18 As shown, an exhaust member 300 having an exhaust channel 310 is provided between two adjacent columns of battery cells 100, and a pressure relief mechanism 140 for releasing exhaust is provided on the side wall adjacent to the battery cell 100 and the exhaust member 300. The pressure relief mechanism 140 is connected to the exhaust channel 310 to guide the exhaust to be discharged.

[0204] The exhaust member 300 may refer to a component disposed between two adjacent columns of battery cells 100 and having an exhaust channel 310 . The exhaust channel 310 may refer to a channel for exhaust gas to flow through.

[0205] For example, the exhaust member 300 may be a hollow plate-like structure, the cavity formed inside the exhaust member 300 is the exhaust channel 310, the exhaust member 300 is located between two adjacent columns of battery cells 100, the exhaust member 300 is provided with a through hole 320 on the side wall facing the battery cell 100, and the pressure relief mechanism 140 is arranged opposite to the through hole 320, so that the exhaust released by the pressure relief mechanism 140 can enter the exhaust channel 310 through the through hole 320 and be discharged to the outside of the battery unit 1101 through the exhaust channel 310. Of course, in other examples, the exhaust member 300 can also be other shapes.

[0206] By adopting the technical solution of this embodiment, the exhaust released by the pressure relief mechanism 140 can flow out of the battery unit 1101 through the exhaust channel 310 of the exhaust member 300, reducing the risk of the exhaust contacting the battery cell 100, which is beneficial to improving the reliability of the battery 1100.

[0207] In other embodiments of the present application, see Fig.19 As shown, at least one battery cell 100 in the battery unit 1101 is a first battery cell 1001 , at least one battery cell 100 in the battery unit 1101 is a second battery cell 1002 , and the electrode assembly 120 in the first battery cell 1001 is vertically arranged with the electrode assembly 120 in the second battery cell 1002 .

[0208] The multiple battery cells 100 of the battery unit 1101 include two battery cells 100 whose electrode assemblies 120 are perpendicular to each other, one of the two battery cells 100 is a first battery cell 1001, and the other is a second battery cell 1002; the number of the first battery cells 1001 may be but not limited to one, two or three, and the number of the second battery cells 1002 may be but not limited to one, two or three. The first battery cells 1001 and the second battery cells 1002 may be distributed in different columns or the same column, in different rows or the same row, or in different layers or the same layer.

[0209] The electrode assembly 120 in the first battery cell 1001 is vertically arranged with respect to the electrode assembly 120 in the second battery cell 1002. It can be understood that the electrode assemblies 120 of the two battery cells 100 are arranged vertically, which may mean that the height directions of the electrode assemblies 120 of the two battery cells 100 are vertical, or the width directions of the electrode assemblies 120 of the two battery cells 100 are vertical, or the length directions of the electrode assemblies 120 of the two battery cells 100 are vertical.

[0210] For the convenience of explanation, the present application embodiment is described by taking the electrode assemblies 120 of two battery cells 100 in a perpendicular width direction as an example. In general, the battery cells 100 are usually oriented in groups along the width direction of the electrode assembly 120, and the electrode assembly 120 expands significantly in the width direction, so that the expansion force of the grouped battery cells 100 in the electrode assembly 120 accumulates in the width direction thereof, and the grouped battery cells 100 are provided with end plates at the outermost sides in the width direction of the electrode assembly 120. The force on the rear end plate is large after the expansion force accumulates, and thicker end plates are required to fix the battery cells 100, which increases the manufacturing cost of the battery 1100; in addition, the heat of the battery cells 100 is also quickly conducted between the battery cells 100 along the width direction of the electrode assembly 120, and thick heat insulation pads need to be added between the battery cells 100, which also increases the manufacturing cost of the battery 1100.

[0211] By adopting the technical solution of this embodiment, the electrode assembly 120 of the first battery cell 1001 and the electrode assembly 120 of the second battery cell 1002 are perpendicular, so that the expansion force of the electrode assembly 120 of the first battery cell 1001 and the expansion force and heat conduction direction of the electrode assembly 120 of the second battery cell 1002 are vertically staggered, thereby reducing the accumulation of expansion force of the battery cell 100 and reducing heat transfer between the battery cells 100, which is beneficial to reducing the thickness of the end plate and the insulation pad and reducing the manufacturing cost of the battery 1100; in addition, the outer shell 110 of the battery cell 100 is a quadrangular prism structure, and the battery cell 100 does not need to distinguish between the length and width directions, which facilitates the vertical distribution of the electrode assemblies 120 in the first battery cell 1001 and the second battery cell 1002, and also facilitates the battery cell 100 to form a regularly shaped battery unit 1101 to meet the usage requirements of different batteries 1100.

[0212] In other embodiments of the present application, see Figure 4 and Fig.19 As shown, the electrode assembly 120 is a flat structure, the surface with the largest area of ​​the electrode assembly 120 is the large surface 121 , and the large surface 121 of the first battery cell 1001 is perpendicular to the large surface 121 of the second battery cell 1002 .

[0213] Generally, the large surface 121 is perpendicular to the width direction of the electrode assembly 120. When the battery cells 100 are grouped, the large surfaces 121 of the battery cells 100 face each other, so that the expansion force between the battery cells 100 accumulates along the direction perpendicular to the large surface 121, and the heat between the battery cells 100 can be quickly conducted through the large surface 121.

[0214] By adopting the technical solution of this embodiment, the expansion is most obvious at the large surface 121, and the large surface 121 of the first battery cell 1001 and the large surface 121 of the second battery cell 1002 are perpendicular, which can effectively reduce the accumulation of expansion force of the battery cell 100. In addition, the large surface 121 has a large area, a large heat transfer area, and the fastest heat transfer, which can also effectively reduce the heat transfer between the battery cells 100.

[0215] In other embodiments of the present application, the first battery cell 1001 includes at least two electrode assemblies 120 stacked together, and the second battery cell 1002 includes at least two electrode assemblies 120 stacked together, and the stacking direction of the electrode assembly 120 of the first battery cell 1001 is perpendicular to the stacking direction of the electrode assembly 120 of the second battery cell 1002.

[0216] The first battery cell 1001 includes more than two electrode assemblies 120. The number of electrode assemblies 120 in the first battery cell 1001 may be but is not limited to two, three or four. For example, the first battery cell 1001 includes four electrode assemblies 120, which are stacked along the width direction of the electrode assembly 120.

[0217] The second battery cell 1002 includes more than two electrode assemblies 120. The number of electrode assemblies 120 in the second battery cell 1002 may be but is not limited to two, three or four. For example, the second battery cell 1002 includes four electrode assemblies 120, which are stacked along the width direction of the electrode assembly 120.

[0218] Generally, the electrode assemblies 120 are stacked along the width direction of the electrode assemblies 120 , the expansion force between the battery cells 100 is accumulated along the stacking direction of the electrode assemblies 120 , and the heat between the battery cells 100 is also quickly conducted along the stacking direction of the electrode assemblies 120 .

[0219] By adopting the technical solution of this embodiment, the expansion of the electrode assembly 120 along the stacking direction is most obvious, and the stacking direction of the electrode assembly 120 of the first battery cell 1001 is perpendicular to the stacking direction of the electrode assembly 120 of the second battery cell 1002, which can effectively reduce the accumulation of expansion force of the battery cell 100. In addition, the heat transfer of the electrode assembly 120 is mainly along the stacking direction, which can also effectively reduce the heat transfer between the battery cells 100.

[0220] In other embodiments of the present application, see Figures 20-22 As shown, the plurality of battery cells 100 along the first direction include a first battery cell 1001 and a second battery cell 1002 ; and / or the plurality of battery cells 100 along the second direction include a first battery cell 1001 and a second battery cell 1002 .

[0221] In one possible embodiment, a plurality of battery cells 100 along a first direction include a first battery cell 1001 and a second battery cell 1002. It can be understood that a row of battery cells 100 is distributed with the first battery cell 1001 and the second battery cell 1002; in the same column of battery cells 100, all battery cells 100 are the first battery cell 1001 or the second battery cell 1002; or, in the same column of battery cells 100, a part of the battery cells 100 are the first battery cell 1001, and another part of the battery cells 100 are the second battery cell 1002.

[0222] A row of battery cells 100 includes at least one first battery subunit 1004 and at least one second battery subunit 1005, the first battery subunit 1004 includes at least one first battery cell 1001, the second battery subunit 1005 includes at least one second battery cell 1101, and the first battery subunit 1004 and the second battery subunit 1005 are alternately arranged along a first direction. The number of first battery cells 1001 in the first battery subunit 1004 may be the same as the number of second battery cells 1002 in the second battery subunit 1005, or may be different.

[0223] For example, see Fig. 20 As shown, the number of first battery cells 1001 in the first battery subunit 1004 may be the same as the number of second battery cells 1002 in the second battery subunit 1005, and the number of first battery cells 1001 in the first battery subunit 1004 may be one, that is, the first battery cells 1001 and the second battery cells 1002 are alternately distributed along the first direction; in the same column of battery cells 100, all battery cells 100 are first battery cells 1001 or second battery cells 1002.

[0224] Of course, in other examples, the number of first battery cells 1001 in the first battery subunit 1004 may be but is not limited to two or three; the number of second battery cells 1002 in the second battery subunit 1005 may be but is not limited to two or three.

[0225] The multiple battery cells 100 along the first direction include a first battery cell 1001 and a second battery cell 1002. The vertical distribution of the electrode assemblies 120 within the first battery cell 1001 and the second battery cell 1002 can reduce the expansion force accumulation and heat transfer of the battery cell 1101 in the first direction, which is beneficial to reducing the thickness of the end plate and the thermal insulation pad and reducing the manufacturing cost of the battery 1100.

[0226] In another possible implementation, see Fig.21 As shown in or 22, the multiple battery cells 100 along the second direction include a first battery cell 1001 and a second battery cell 1002. It can be understood that the first battery cell 1001 and the second battery cell 1002 are distributed in a column of battery cells 100; in the same row of battery cells 100, all the battery cells 100 are the first battery cell 1001 or the second battery cell 1002; or, in the same row of battery cells 100, a part of the battery cells 100 are the first battery cell 1001, and the other part of the battery cells 100 are the second battery cell 1002.

[0227] A column of battery cells 100 includes at least one third battery subunit 1006 and at least one fourth battery subunit 1007. The third battery subunit 1006 includes at least one first battery cell 1001, and the fourth battery subunit 1007 includes at least one second battery cell 1101. The third battery subunit 1006 and the fourth battery subunit 1007 are alternately arranged along the second direction. The number of first battery cells 1001 in the third battery subunit 1006 may be the same as or different from the number of second battery cells 1002 in the fourth battery subunit 1007.

[0228] For example, see Fig.21 As shown, the number of the first battery cells 1001 in the third battery subunit 1006 may be the same as the number of the second battery cells 1002 in the fourth battery subunit 1007, and the number of the first battery cells 1001 in the third battery subunit 1006 may be three; see Fig. 22 As shown, the number of the first battery cells 1001 in the third battery subunit 1006 may be one; that is, the first battery cells 1001 and the second battery cells 1002 are alternately distributed along the second direction.

[0229] Of course, in other examples, the number of first battery cells 1001 in the third battery subunit 1006 may be but is not limited to two or four; the number of second battery cells 1002 in the fourth battery subunit 1007 may be but is not limited to two or four.

[0230] The plurality of battery cells 100 along the second direction include first battery cells 1001 and second battery cells 1002 , and the expansion force accumulation and heat transfer of the battery cells 1101 in the second direction can be reduced by vertical distribution of the electrode assemblies 120 in the first battery cells 1001 and the second battery cells 1002 .

[0231] In yet another possible embodiment, see Fig.21 and Fig. 22 As shown, a plurality of battery cells 100 along a first direction include a first battery cell 1001 and a second battery cell 1002, and a plurality of battery cells 100 along a second direction include a first battery cell 1001 and a second battery cell 1002; the vertical distribution of the electrode assemblies 120 within the first battery cell 1001 and the second battery cell 1002 can reduce the expansion force accumulation and heat transfer of the battery cell 1101 in the second direction and the first direction, which is beneficial to reduce the thickness of the end plate and the thermal insulation pad, and reduce the manufacturing cost of the battery 1100.

[0232] By adopting the technical solution of this embodiment, the expansion force accumulation and heat transfer of the battery cell 1101 in the first direction and / or the second direction can be reduced.

[0233] In other embodiments of the present application, see Fig. 22 As shown, multiple battery cells 100 along the first direction include a first battery cell 1001 and a second battery cell 1002, and multiple battery cells 100 along the second direction include a first battery cell 1001 and a second battery cell 1002. The first battery cells 1001 and the second battery cells 1002 along the first direction are alternately arranged, and the first battery cells 1001 and the first battery cells 1001 along the second direction are alternately arranged.

[0234] It can be understood that the number of the first battery cells 1001 in the first battery subunit 1004 and the second battery cells 1002 in the second battery subunit 1005 is one, that is, the first battery cells 1001 and the second battery cells 1002 are alternately distributed along the first direction. The number of the first battery cells 1001 in the third battery subunit 1006 and the second battery cells 1002 in the fourth battery subunit 1007 is one, that is, the first battery cells 1001 and the second battery cells 1002 are alternately distributed along the second direction.

[0235] By adopting the technical solution of this embodiment, the first battery cells 1001 and the second battery cells 1002 are alternately arranged in the first direction and the second direction, which can better reduce the expansion force accumulation and heat transfer of the battery unit 1101 in the first direction and the second direction.

[0236] For example, see Fig. 20 As shown, the number of the first battery cell 1001 in the first battery subunit 1004 and the second battery cell 1002 in the second battery subunit 1005 is one, that is, the first battery cell 1001 and the second battery cell 1002 are alternately distributed along the first direction. In two adjacent columns of battery cells 100, all the battery cells 100 in one column of battery cells 100 are first battery cells 1001, and all the battery cells 100 in the other column of battery cells 100 are second battery cells 1002.

[0237] For example, see Fig.21 As shown, the number of the first battery cell 1001 in the first battery subunit 1004 and the second battery cell 1002 in the second battery subunit 1005 is one, that is, the first battery cell 1001 and the second battery cell 1002 are alternately distributed along the first direction. The number of the first battery cell 1001 in the third battery subunit 1006 and the second battery cell 1002 in the fourth battery subunit 1007 are three, that is, the third battery subunit 1006 and the fourth battery subunit 1007 are alternately distributed along the second direction.

[0238] For example, see Fig. 22As shown, the number of the first battery cells 1001 in the first battery subunit 1004 and the second battery cells 1002 in the second battery subunit 1005 are one, that is, the first battery cells 1001 and the second battery cells 1002 are alternately distributed along the first direction. The number of the first battery cells 1001 in the third battery subunit 1006 and the second battery cells 1002 in the fourth battery subunit 1007 are one, that is, the first battery cells 1001 and the second battery cells 1002 are alternately distributed along the second direction.

[0239] In other embodiments of the present application, see Figures 23 to 25 As shown, the battery unit 1101 includes multiple layers of battery cells 100, which are stacked along a third direction. The multiple battery cells 100 arranged along the third direction include a first battery cell 1001 and a second battery cell 1002, and the first direction and the second direction are perpendicular to the third direction.

[0240] The battery cells 100 can be stacked along a third direction so that multiple layers of battery cells 100 are stacked along the third direction. Among the battery cells 100 arranged along the third direction, at least one battery cell 100 is a first battery cell 1001, and at least one battery cell 100 is a second battery cell 1002, that is, in the third direction, the first battery cell 1001 and the second battery cell 1002 can be distributed in different layers of battery cells 100; in the same layer of battery cells 100, all battery cells 100 are first battery cells 1001 or second battery cells 1002; or, in the same layer of battery cells 100, a part of the battery cells 100 are first battery cells 1001, and another part of the battery cells 100 are second battery cells 1002.

[0241] The battery cells 100 arranged along the third direction include at least one fifth battery subunit 1008 and at least one sixth battery subunit 1009, the fifth battery subunit 1008 includes at least one first battery cell 1001, the sixth battery subunit 1009 includes at least one second battery cell 1101, and the fifth battery subunit 1008 and the sixth battery subunit 1009 are alternately arranged along the third direction. The number of the first battery cells 1001 in the fifth battery subunit 1008 may be the same as the number of the second battery cells 1002 in the sixth battery subunit 1009, or may be different.

[0242] Of course, in other examples, the number of first battery cells 1001 in the fifth battery subunit 1008 may be but is not limited to one, two or three; the number of second battery cells 1002 in the sixth battery subunit 1009 may be but is not limited to one, two or three.

[0243] By adopting the technical solution of this embodiment, the multiple battery cells 100 along the third direction include the first battery cell 1001 and the second battery cell 1002, and the expansion force accumulation and heat transfer of the battery cell 1101 in the third direction can be reduced through the vertical distribution of the electrode assemblies 120 in the first battery cell 1001 and the second battery cell 1002.

[0244] In other embodiments of the present application, see Fig.25 As shown, the first battery cells 1001 and the second battery cells 1002 along the third direction are alternately arranged.

[0245] It can be understood that the number of the first battery cells 1001 in the fifth battery subunit 1008 and the number of the second battery cells 1002 in the sixth battery subunit 1009 is one, that is, the first battery cells 1001 and the second battery cells 1002 are alternately distributed along the third direction.

[0246] Generally, since two adjacent layers of battery cells 100 expand in the same direction, expansion space needs to be reserved between the two adjacent layers. However, the expansion space will affect the structural strength of the battery cell 1101, which may cause the structural strength of the battery cell 1101 to fail to meet the requirements. Therefore, the battery cell 100 is usually set to a two-layer structure.

[0247] By adopting the technical solution of this embodiment, the first battery cells 1001 and the second battery cells 1002 are alternately arranged in the third direction, which can better reduce the expansion force accumulation and heat transfer of the battery unit 1101 in the third direction; in addition, the first battery cells 1001 and the second battery cells 1002 are alternately distributed along the third direction, so that there is no need to reserve expansion space between two adjacent layers of battery cells 100, which is conducive to realizing a stacking method of more than three layers of battery cells 100.

[0248] For example, see Fig.23 As shown, the number of the first battery cells 1001 in the fifth battery subunit 1008 and the number of the second battery cells 1002 in the sixth battery subunit 1009 is one, that is, the first battery cells 1001 and the second battery cells 1002 are alternately distributed along the third direction. In two adjacent columns of battery cells 100 along the third direction, all the battery cells 100 in one column of battery cells 100 are first battery cells 1001, and all the battery cells 100 in the other column of battery cells 100 are second battery cells 1002.

[0249] For example, see Fig.24As shown, the number of the first battery cell 1001 in the fifth battery subunit 1008 and the second battery cell 1002 in the sixth battery subunit 1009 is one, that is, the first battery cell 1001 and the second battery cell 1002 are alternately distributed along the third direction. The number of the first battery cell 1001 in the third battery subunit 1006 and the second battery cell 1002 in the fourth battery subunit 1007 are three, that is, the third battery subunit 1006 and the fourth battery subunit 1007 are alternately distributed along the second direction.

[0250] For example, see Fig.25 As shown, the number of the first battery cells 1001 in the fifth battery subunit 1008 and the second battery cells 1002 in the sixth battery subunit 1009 is one, that is, the first battery cells 1001 and the second battery cells 1002 are alternately distributed along the third direction. The number of the first battery cells 1001 in the third battery subunit 1006 and the second battery cells 1002 in the fourth battery subunit 1007 is one, that is, the third battery subunit 1006 and the fourth battery subunit 1007 are alternately distributed along the second direction.

[0251] The battery 1100 according to the embodiment of the present application is described in conjunction with some specific embodiments.

[0252] Embodiment 5

[0253] In this embodiment, see Figure 2 , Fig.11 , Fig.15 and Fig.16 As shown, the battery 1100 includes a battery unit 1101 , and the battery unit 1101 includes at least one battery cell 100 as described in the above embodiment.

[0254] In this embodiment, the battery unit 1101 includes at least one layer of battery cells 100, each layer of battery cells 100 includes a plurality of battery cells 100 arranged in a matrix along a first direction and a second direction, the first direction being perpendicular to the second direction.

[0255] In this embodiment, the first electrode terminal 131 and the second electrode terminal 132 are arranged on the first side wall 113, and the first side wall 113 is perpendicular to the third direction. In the same layer of battery cells 100, all first side walls 113 are located on the same side of the corresponding layer of battery cells 100, and the first direction and the second direction are perpendicular to the third direction.

[0256] In this embodiment, the first electrode terminals 131 and the second electrode terminals 132 of two adjacent battery cells 100 are arranged in a perpendicular or parallel direction.

[0257] Embodiment 6

[0258] The difference between this embodiment and the fifth embodiment is that: Fig.17 As shown, the adjacent corners of four adjacent battery cells 100 are each provided with a first electrode terminal 131 or a second electrode terminal 132 .

[0259] Embodiment 7

[0260] The difference between this embodiment and the fifth embodiment is that: Fig.12 and Fig.13 As shown, the first electrode terminal 131 and the second electrode terminal 132 are disposed on the first side wall 113, and the first side wall 113 is perpendicular to the first direction. The number of layers of the battery cell 100 is two.

[0261] In this embodiment, in the same layer of battery cells 100, every two adjacent columns of battery cells 100 arranged along the second direction form a battery group 1003; in the same battery group 1003, the first side walls 113 of two battery cells 100 arranged along the first direction are arranged back to back.

[0262] Embodiment 8

[0263] The difference between this embodiment and the seventh embodiment is that: Fig.14 As shown, in the same layer of battery cells 100, every two adjacent columns of battery cells 100 arranged along the second direction form a battery group 1003; in the same battery group 1003, the first side walls 113 of two battery cells 100 arranged along the first direction are arranged facing each other.

[0264] In this embodiment, see Fig.18 As shown, an exhaust member 300 having an exhaust channel 310 is provided between two adjacent columns of battery cells 100, and a pressure relief mechanism 140 for releasing exhaust is provided on the side wall adjacent to the battery cell 100 and the exhaust member 300. The pressure relief mechanism 140 is connected to the exhaust channel 310 to guide the exhaust to be discharged.

[0265] Embodiment 9

[0266] The difference between this embodiment and the fifth embodiment is that: Figure 4 , Fig.19 and Fig. 20 As shown, at least one battery cell 100 in the battery unit 1101 is a first battery cell 1001 , at least one battery cell 100 in the battery unit 1101 is a second battery cell 1002 , and the electrode assembly 120 in the first battery cell 1001 is vertically arranged with the electrode assembly 120 in the second battery cell 1002 .

[0267] In this embodiment, the electrode assembly 120 is a flat structure, the surface with the largest area of ​​the electrode assembly 120 is the large surface 121 , and the large surface 121 of the first battery cell 1001 is perpendicular to the large surface 121 of the second battery cell 1002 .

[0268] In this embodiment, the first battery cell 1001 includes at least two electrode assemblies 120 stacked together, and the second battery cell 1002 includes at least two electrode assemblies 120 stacked together. The stacking direction of the electrode assembly 120 of the first battery cell 1001 is perpendicular to the stacking direction of the electrode assembly 120 of the second battery cell 1002.

[0269] In this embodiment, a plurality of battery cells 100 along a first direction include a first battery cell 1001 and a second battery cell 1002. It can be understood that a row of battery cells 100 includes at least one first battery sub-unit 1004 and at least one second battery sub-unit 1005, the first battery sub-unit 1004 includes at least one first battery cell 1001, the second battery sub-unit 1005 includes at least one second battery cell 1101, the first battery sub-unit 1004 and the second battery sub-unit 1005 are alternately arranged along the first direction, the number of the first battery cell 1001 in the first battery sub-unit 1004 and the second battery cell 1002 in the second battery sub-unit 1005 is one, that is, the first battery cell 1001 and the second battery cell 1002 are alternately distributed along the first direction.

[0270] In this embodiment, in two adjacent columns of battery cells 100 , all the battery cells 100 in one column of battery cells 100 are first battery cells 1001 , and all the battery cells 100 in the other column of battery cells 100 are second battery cells 1002 .

[0271] Embodiment 10

[0272] The difference between this embodiment and the ninth embodiment is that: Fig.21 As shown, a column of battery cells 100 includes at least one third battery subunit 1006 and at least one fourth battery subunit 1007, the third battery subunit 1006 includes at least one first battery cell 1001, the fourth battery subunit 1007 includes at least one second battery cell 1101, and the third battery subunit 1006 and the fourth battery subunit 1007 are alternately arranged along the second direction. The number of the first battery cells 1001 in the third battery subunit 1006 and the second battery cells 1002 in the fourth battery subunit 1007 is three, that is, the third battery subunit 1006 and the fourth battery subunit 1007 are alternately distributed along the second direction.

[0273] Embodiment 11

[0274] The difference between this embodiment and the tenth embodiment is that: Fig. 22 As shown, the multiple battery cells 100 along the second direction include a first battery cell 1001 and a second battery cell 1002, and the first battery cells 1001 and the first battery cells 1001 along the second direction are alternately arranged. It can be understood that the number of the first battery cells 1001 in the third battery subunit 1006 and the second battery cells 1002 in the fourth battery subunit 1007 is one, that is, the first battery cells 1001 and the second battery cells 1002 are alternately distributed along the second direction.

[0275] Embodiment 12

[0276] The difference between this embodiment and the ninth embodiment is that: Fig.23 As shown, the battery cell 1101 includes a plurality of layers of battery cells 100, and the plurality of battery cells 100 are stacked along a third direction. The plurality of battery cells 100 arranged along the third direction include a first battery cell 1001 and a second battery cell 1002, and the first direction and the second direction are perpendicular to the third direction; it can be understood that the battery cells 100 arranged along the third direction include at least one fifth battery sub-cell 1008 and at least one sixth battery sub-cell 1009, the fifth battery sub-cell 1008 includes at least one first battery cell 1001, the sixth battery sub-cell 1009 includes at least one second battery cell 1101, and the fifth battery sub-cell 1008 and the sixth battery sub-cell 1009 are alternately arranged along the third direction.

[0277] In this embodiment, the first battery cells 1001 and the second battery cells 1002 are alternately arranged along the third direction. It can be understood that the number of the first battery cells 1001 in the fifth battery subunit 1008 and the second battery cells 1002 in the sixth battery subunit 1009 is one, that is, the first battery cells 1001 and the second battery cells 1002 are alternately distributed along the third direction.

[0278] In this embodiment, in two adjacent columns of battery cells 100 along the third direction, all the battery cells 100 in one column of battery cells 100 are first battery cells 1001 , and all the battery cells 100 in the other column of battery cells 100 are second battery cells 1002 .

[0279] Embodiment 13

[0280] The difference between this embodiment and the twelfth embodiment is that: Fig.24 As shown, the number of the first battery cells 1001 in the third battery subunit 1006 and the number of the second battery cells 1002 in the fourth battery subunit 1007 are three, that is, the third battery subunit 1006 and the fourth battery subunit 1007 are alternately distributed along the second direction.

[0281] Embodiment 14

[0282] The difference between this embodiment and the thirteenth embodiment is that: Fig.25 As shown, the number of the first battery cells 1001 in the third battery subunit 1006 and the number of the second battery cells 1002 in the fourth battery subunit 1007 is one, that is, the third battery subunit 1006 and the fourth battery subunit 1007 are alternately distributed along the second direction.

[0283] In other embodiments of the present application, an electrical device is provided, comprising the battery 1100 as described in the above embodiments.

[0284] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0285] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include, shell; An electrode assembly, disposed in the housing; a first electrode terminal electrically connected to the electrode assembly; a second electrode terminal, electrically connected to the electrode assembly, the first electrode terminal and the second electrode terminal having different polarities for outputting or inputting electrical energy; The shell is a prismatic structure, having a first side wall and a second side wall that are axially opposite to each other, the first side wall and the second side wall are square, and at least one of the first electrode terminal and the second electrode terminal is disposed on the first side wall or the second side wall.

2. The battery cell according to claim 1, characterized in that: The first electrode terminal and the second electrode terminal are disposed on the first side wall, and an angle α is formed between an arrangement direction of the first electrode terminal and the second electrode terminal and a length direction of the first side wall, wherein 0°≤α≤45°.

3. The battery cell according to claim 2, characterized in that: The first electrode terminal and the second electrode terminal are respectively located at two opposite corners of the first side wall.

4. The battery cell according to any one of claims 1 to 3, characterized in that: The first electrode terminal and the second electrode terminal are arranged on the first side wall, and the first side wall is provided with at least one pressure relief mechanism for releasing emissions; and / or, the second side wall is provided with at least one pressure relief mechanism for releasing emissions.

5. The battery cell according to claim 4, characterized in that: The pressure relief mechanism comprises a circular pressure relief mechanism.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The electrode assembly is a flat structure.

7. The battery cell according to claim 6, characterized in that: The shell also has a third side wall and a fourth side wall parallel to and adjacent to the axial direction. The surface with the largest area of ​​the electrode assembly is the large surface. The third side wall is arranged opposite to the large surface. The thickness of the third side wall is greater than the thickness of the fourth side wall.

8. The battery cell according to any one of claims 1 to 7, characterized in that: The housing includes a shell and an end cover, wherein the end cover covers the opening of the shell, the end cover forms the first side wall, and the side wall of the shell opposite to the end cover forms the second side wall; or, the end cover forms the second side wall, and the side wall of the shell opposite to the end cover forms the first side wall.

9. A battery, characterized in that: The invention comprises a battery unit, wherein the battery unit comprises at least one battery cell according to any one of claims 1 to 8.

10. The battery according to claim 9, characterized in that: The battery unit includes at least one layer of battery cells, and each layer of battery cells includes a plurality of battery cells arranged in a matrix along a first direction and a second direction, wherein the first direction is perpendicular to the second direction.

11. The battery according to claim 10, characterized in that: The first electrode terminal and the second electrode terminal are arranged on the first side wall, the first side wall is perpendicular to the third direction, in the same layer of battery cells, all the first side walls are located on the same side of the battery cells in the corresponding layer, and the first direction and the second direction are perpendicular to the third direction.

12. The battery according to claim 10, characterized in that: The first electrode terminal and the second electrode terminal are disposed on the first side wall, and the first side wall is perpendicular to the first direction.

13. The battery according to claim 12, characterized in that: In the same layer of battery cells, every two adjacent columns of battery cells arranged along the second direction form a battery group; in the same battery group, the first side walls of the two battery cells arranged along the first direction are arranged back to back or facing each other.

14. The battery according to any one of claims 11 to 13, characterized in that: The first electrode terminals and the second electrode terminals of two adjacent battery cells are arranged in a perpendicular or parallel direction.

15. The battery according to any one of claims 11 to 14, characterized in that: The first electrode terminal or the second electrode terminal is disposed at mutually adjacent corners of four adjacent battery cells.

16. The battery according to any one of claims 10 to 15, characterized in that: An exhaust member with an exhaust channel is provided between two adjacent rows of battery cells, and a pressure relief mechanism for releasing exhaust is provided on the side wall of the battery cell adjacent to the exhaust member. The pressure relief mechanism is connected to the exhaust channel to guide the exhaust to be discharged.

17. The battery according to any one of claims 10 to 16, characterized in that: At least one of the battery cells in the battery unit is a first battery cell, at least one of the battery cells in the battery unit is a second battery cell, and the electrode assembly in the first battery cell is vertically arranged to the electrode assembly in the second battery cell.

18. The battery according to claim 17, characterized in that: The electrode assembly is a flat structure, the surface with the largest area of ​​the electrode assembly is a large surface, and the large surface of the first battery cell is perpendicular to the large surface of the second battery cell.

19. The battery according to claim 17 or 18, characterized in that: The first battery cell includes at least two stacked electrode assemblies, and the second battery cell includes at least two stacked electrode assemblies. The stacking direction of the electrode assemblies of the first battery cell is perpendicular to the stacking direction of the electrode assemblies of the second battery cell.

20. The battery according to any one of claims 17 to 19, characterized in that: The plurality of battery cells along the first direction include a first battery cell and a second battery cell; and / or the plurality of battery cells along the second direction include a first battery cell and a second battery cell.

21. The battery according to claim 20, characterized in that: The plurality of battery cells along the first direction include a first battery cell and a second battery cell, the plurality of battery cells along the second direction include a first battery cell and a second battery cell, the first battery cells and the second battery cells along the first direction are alternately arranged, and the first battery cells and the first battery cells along the second direction are alternately arranged.

22. The battery according to any one of claims 17 to 21, characterized in that: The battery unit includes a plurality of battery cells stacked along a third direction. The plurality of battery cells arranged along the third direction include a first battery cell and a second battery cell. The first direction and the second direction are perpendicular to the third direction.

23. The battery according to claim 22, characterized in that: The first battery cells and the second battery cells along the third direction are alternately arranged.

24. An electrical device, characterized in that: A battery comprising the battery according to any one of claims 9 to 23.

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